Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea37034041d467cb…

MALICIOUS

PDF

73.4 KB Created: 2021-09-11 18:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7a23ff361e568180e7cc4d2932664195 SHA-1: 1fd81d4f2ad947ea0b9f284f367e4f16ad6bb3b7 SHA-256: ea37034041d467cb278c1144eee584ce530eaee9c28d5bd2c637499d106c14ae
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=apps+for+android+tv PDF link annotation
    • http://eastindiaspray.com/suvra/eastindia_spray/files/xorovakepevokaguvevodewif.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/25724945649.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/47845935213.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/99995159889.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/guliketoxuzedoxutaborodi.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/17681710815.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/zofopubepoxozamemojiben.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/zaditusolubujuget.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/54846087589.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613886f196179---45483726011.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/dusatabudulotajejovitakof.pdfIn PDF document text
    • http://hanifeugur.com/image/files/37867566990.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/budunof.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/90234707445.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/safadiwizikumikitanonoz.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/63500403544.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/teluzawawitemusugefid.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/5728146574.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/93765595681.pdfIn PDF document text
    • https://omegaplus.bg/uploads/pages/files/danodepupen.pdfIn PDF document text
    • http://griesvoegwerken.nl/UserFiles/file/23443195962.pdfIn PDF document text
    • https://kluchar.net/klucharnet/images/file/83542419226.pdfIn PDF document text
    • http://utcsp.rustyramone.com/uploads/files/37435061884.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0F 16308 bytes
SHA-256: 8c2c40d0d7d96970183fe09671364b1a074e39847c5ba4f7d3b3e003483a547a
font_01_sfnt_off0000e8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 10360 bytes
SHA-256: 7bed72b9e6a15678dda4083717b41f9ddc38f4683a7889853a63023037009741